Reviewer:
Tony Lance
-
September 9, 2010 Subject:
Four drawings among others.
The book contains the following four drawings among others. Indeed the Segway owes much to monorail half caption. 1. Drawing of a clockwork spider wheel
...
and hairpin. Extract from Introductory Chapter;- The "Spider tops," which are frequently sold in the streets of London, consist of a heavy little disc mounted on a spindle (Fig. XIV.). When the disc has been set spinning a small curved piece of metal is placed to touch the toe, and at once begins to slide round it, first the side (a) in the figure, and then the side (b), the motion continuing backwards and forwards till the top comes to rest. The fact is that the toe is magnetic, and this being the case it is easy to see that the rolling of the toe on the side of the metal produces the motion. 2. Drawing of an ordinary gyroscope. Caption:- Fig. XVI Extract from the Introductory Chapter:- But the most interesting top of all is undoubtedly the ordinary gyroscope. That depicted in Fig. XVI........ although merely sold as a toy, is nevertheless capable of illustrating the gyroscopic phenomena which have been so much made use of in modern mechanical invention. 3. Detail in photgraph of a model of Track on the Bottom Monorail Half. Caption;- Schilowsky's Monorail Car. Extract from Chapter V;- 73. Another ingenious application of the gyroscope to a monorail car has lately (Feb., 1914) been made by Monsieur Schilowsky, a Russian inventor..... So far as experiments have gone at present the weight of the gyroscope is designed to be something between 1/10th and 1/25th of the whole weight of the car, while the two pendulums together are about 1/3rd of the weight of the gyroscope. The author is indebted to M. Schilosky both for the diagrams and the photograph from which plate IV has been made. A model of the car has been presented by the inventor to the Science Museum at South Kensington and can be viewed by the public at anytime. An article on this monorail is to be found in the issue of The Engineer for January 23, 1914. 4. Drawing of model of track on the bottom monorail. Caption;- Model exhibited before the Royal Society, May 8, 1907. Extract from Chapter V;- 72. The gyroscope has been employed by Mr. Louis Brennan with striking ingenuity and success, to ensure the stability of a heavy car travelling on a single line of rail, with its centre of gravity above the level of the rail, as is seen in the accompanying illustrations.... A full description of the mechanism, with a mathematical discussion on the subject, is given by Mr. H. Cousins in the issue of Engineering for Nov. 21st, 1913, and following numbers. From the book An Elementary Treatment of the Theory of Spinning Tops and Gyroscopic Motion. By Harold Crabtree M.A. Formerly Scholar of Pembroke College, Cambridge Assistant Master at Charterhouse Longmans, Green and Co. 1923 First Edition 1909 Second Edition 1914 New Impression 1923 By Tony Lance 9th September 2010 tonylance@myinternetuk.com www.tonylance.talktalk.net
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